Vaporization characteristics of suspended droplets of biodiesel fuels of Indian origin and their diesel blends – An experimental study

Manjunath, More; Raghavan, Vasudevan; Mehta, Pramod S.

doi:10.1016/j.ijheatmasstransfer.2015.04.052

Cited by 39 publications

(14 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3, all curves follow the D 2law in the steady evaporation phase. Unlike at the higher ambient temperatures, results at T a = 473 K showed slight fluctuations in this phase, which agrees with Manjunath's results (Manjunath et al 2015). At such a low evaporation rate, lighter constituent esters evaporated first due to their lower boiling points which caused the fluctuations in the steady evaporation period.…”

Section: Palm Biodiesel Evaporation Characteristicssupporting

confidence: 88%

“…An initial expansion period was observed for all ambient temperatures, followed by a steady evaporation region prior to extinction. This behaviour follows that observed for 473-673 K (Hashimoto et al 2015) and for 473-523 K (Manjunath et al 2015). With the increase in ambient temperature, the evaporation rate increases, and the droplet lifetime decreases.…”

Section: Palm Biodiesel Evaporation Characteristicssupporting

confidence: 86%

“…Residues were observed for PME at the lowest temperature and for higher carbon esters, which decreased and disappeared with increased temperature as a result of the rate of polymerisation reactions being overtaken by the evaporation rate. Manjunath et al (2015) evaluated the evaporation of various biodiesel fuels of Indian origin (including PME) and their blends at a temperature range from 423 to 523 K. They found an indeterminate uniform evaporation phase for PME at 423 K, which could be explained by the volatility and reduction of thermal diffusivity. The long-chain saturation factor was observed to be inversely proportional to the vaporisation constant, supporting the trend of more volatile fuel having a greater vaporisation rate.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental study of evaporation of palm biodiesel with multi-walled carbon nanotubes additives at elevated temperatures

Amsal

Tran

Hung

et al. 2021

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

Evaporation characteristics of palm biodiesel blended with multi-walled carbon nanotubes (MWCNTs) with different concentrations and outer diameters at ambient temperatures between 473 and 673 K have been investigated. Nano-additives were dispersed in concentration doses of 100 ppm and 200 ppm and outer diameters of 10-20 nm and 30-50 nm. Results showed that droplets underwent an initial heating period and a steady evaporation period without the occurrence of micro-explosions or puffing. In the steady evaporation period, the D 2 -law could be applied for all mixtures. Then droplets completely vaporised at the end of their lifetime. MWCNTs with smaller outer diameters (10-20 nm) exhibited a significantly greater enhancement of the evaporation constant across all temperatures, while larger outer diameters (30-50 mm) only provided improvement at higher ambient temperatures (> 600 K). A high degree of temperature dependence with the concentration of larger MWCNTs (30-50 nm) was observed with retardation of evaporation at lower ambient temperatures (< 523 K) and significant enhancement at higher ambient temperatures (> 600 K). The results suggested an internal aggregation mechanism of MWCNTs contributing to heat transfer to be responsible for this behaviour. Smaller MWCNTs (10-20 nm) with lower concentration (100 ppm) were found to provide the maximum enhancement of evaporation in the temperature domain of interest.

show abstract

Section: Palm Biodiesel Evaporation Characteristicssupporting

confidence: 88%

Section: Palm Biodiesel Evaporation Characteristicssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental study of evaporation of palm biodiesel with multi-walled carbon nanotubes additives at elevated temperatures

Amsal

Tran

Hung

et al. 2021

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…When the surfactant was added to as-received boron/Jet A-1 suspension, the quality of suspension improved and lasted for a maximum of 3 h for 1% particle loading. The use of a surfactant to stabilize the suspension of solid particles and liquid fuel is well-known. − A long chain of surfactant molecules forms a layer around the particle surface. This layer creates a repulsive force that helps in overcoming the van der Waals force of attraction between the particles.…”

Section: Resultsmentioning

confidence: 99%

Effect of Silane Capping on the Dispersion and Combustion Characteristics of Sub-micrometer Boron Particles Loaded in Jet A-1

Ojha

Karmakar

2018

Energy Fuels

View full text Add to dashboard Cite

The present investigation deals with the surface modification of sub-micrometer boron particles with octadecyltrimethoxysilane (OTMS, a silane compound) to improve the dispersion stability of boron particles in liquid fuel. Characterizations of as-received and silane-coated boron particles in terms of the particle size, morphology, surface chemistry, ignition temperature, and oxidation profile have been conducted using typical material characterization methods, such as scanning electron microscopy, scanning transmission electron microscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis (TGA). The results show that the surfaces of as-received boron particles have been successfully functionalized via a condensation reaction of hydroxyl function groups (−OH) with OTMS molecules. The capping of OTMS on the boron surface makes the particle stable against air oxidation. The dispersion stabilities of OTMS-capped boron in Jet A-1 at particle loadings of 1, 5, and 10% are found out to be 20, 18, and 2 h, respectively. Ignition and combustion characteristics of as-received and silane-coated boron particles loaded in Jet A-1 at desired concentrations have been analyzed to understand the effect of silane coating. TGA, true color flame images, and spectroscopic results show that the burning process of OTMS-capped boron is slightly delayed in comparison to as-received boron. The droplet diameter regression profiles show smooth regression up to 70–80% of the droplet lifetime with some intermittent puffing with disruptions at a later stage in both of the particle cases. However, the intensity of disruption is stronger in the case of OTMS-capped boron because of the formation of a more compact shell inside the droplet as a result of the melting of the OTMS layer (particularly toward the end of the droplet lifetime). The micrographs of the combustion residue reveal that some tiny holes are present on the residue surface in the case of as-received boron, whereas multiple blow holes are there in the case of OTMS-capped boron. A blanket of silicon seems to cover the particle surface, which makes them stick together.

show abstract

“…Polymerisation reactions, residue, and the influence of constituent fatty acids were observed at the latter stages of evaporation, particularly at lower temperatures. Manjunath et al [11,12] monitored PME evaporation in a weakly convective flow at ambient temperatures of 423-573 K. The long-chain saturation factor is found to influence the vaporisation constants with larger-chain hydrocarbons exhibiting lower evaporation rates. Additive studies with ceria [13] and carbon nanotubes [14] further elucidated the influence of the multicomponent nature of PME with variance both in additive concentration and temperature.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Palm Biodiesel Droplet Evaporation at Various Temperatures and Pressures

Amsal

Tran

Hung

et al. 2023

International Journal of Energy Research

View full text Add to dashboard Cite

This study uses numerical simulations to determine the evaporation characteristics of palm biodiesel droplets under normal gravity at temperatures ranging from 473 to 873 K and pressures ranging from 0.2 to 5 bar. A transient, two-phase, axisymmetric volume of fluid (VOF) model is employed to model transport processes across phases. The palm methyl ester is modelled as a single-component fuel with temperature- and pressure-dependent thermophysical properties. The study compares the obtained evaporation rates with those available in the literature and presents the effects of external parameters in experimental setups. Additionally, the study investigates the effects of changing the oxygen/nitrogen composition of the environment at elevated temperatures. The results show that elevated temperatures enhance the evaporation rate at all pressures and oxygen contents due to significantly enhanced thermal conductivity and droplet surface temperatures, while elevated pressures decrease the evaporation rates. Across the pressure range, evaporation rates decrease by 219%, 213%, and 196% for temperatures of 473, 673, and 873 K, respectively. Furthermore, increasing oxygen concentration in the environment can also increase the evaporation rate; however, the effect is less noticeable with a 6.4% increase at 473 K and more significant with a 27.8% increase at 873 K across the selected oxygen composition range.

show abstract

Vaporization characteristics of suspended droplets of biodiesel fuels of Indian origin and their diesel blends – An experimental study

Cited by 39 publications

References 24 publications

Experimental study of evaporation of palm biodiesel with multi-walled carbon nanotubes additives at elevated temperatures

Experimental study of evaporation of palm biodiesel with multi-walled carbon nanotubes additives at elevated temperatures

Effect of Silane Capping on the Dispersion and Combustion Characteristics of Sub-micrometer Boron Particles Loaded in Jet A-1

Numerical Simulation of Palm Biodiesel Droplet Evaporation at Various Temperatures and Pressures

Contact Info

Product

Resources

About